Update some toRdf test inputs to better mach the expand version.

Author: gkellogg

tests/toRdf/st04-in.jsonld

@@ -1,8 +1,8 @@
-[{
+{
   "@id": "ex:s",
-  "ex:p": [{
+  "ex:p": {
     "@triple": {
-      "ex:prop": [{"@value": "value"}]
+      "ex:prop": "value"
     }
-  }]
-}]
+  }
+}

tests/toRdf/st05-in.jsonld

@@ -1,7 +1,9 @@
 {
-  "@reifies": {
-    "@id": "ex:rei",
-    "ex:prop": "value"
-  },
-  "ex:prop": "value2"
-}
+  "@id": "ex:s",
+  "ex:p": {
+    "@triple": {
+      "@id": "ex:rei",
+      "ex:prop": "value"
+    }
+  }
+}